Mullens, from Spain Park High School in Hoover, Ala., was Gatorade Player of the Year in his state in 2012. The 6-foot-1, 170-pounder passed for 3,649 yards with 40 touchdowns and just seven interceptions as a senior.

Mullens is rated a two-star prospect on the 247 Sports composite system, which incorporates ESPN, Scout and Rivals rankings. He had been committed for the last two weeks to UAB -- Southern Miss' Conference USA rival -- after first pledging to Jacksonville State.